The remains of the Castle can be visited
Eisenberg Castle (Ruin)

The high medieval castle complex Eisenberg Ruin is located on a foothill of the Tannheim Mountains in the Ostallgäu region. Together with the nearby Hohenfreyberg Ruin, it forms a double castle that shapes the landscape.
History+
The origins of Eisenberg Castle date back to around 1315, when the noble lords of Hohenegg began its construction. They had retreated to the Allgäu to escape the expansionist ambitions of the Tyrolean Count Meinhard II, who had seized their castles of Loch and Vilsegg. The castle was first documented around 1340. In 1382, the Hoheneggs were forced to sell the fortress to the Austrian Archduke Leopold, who soon after enfeoffed it to Friedrich von Freyberg, the son-in-law of the last Hohenegg lord. During the Peasants' War in 1525, the castle suffered damage, for which the family was compensated ten years later. In September 1646, it was evacuated and set on fire by the Tyrolean state government to prevent it from falling intact into the hands of the approaching Protestant army.
Source: Wikipedia · Licence: CC BY-SA 4.0
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 47.6128, 10.5903